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Asthma Prevalence and Incidence

Prevalence

Incidence

 

Prevalence

 

As part of the Canadian Community Health Survey (CCHS), respondents were asked if they had been diagnosed with certain health conditions by a health professional that were expected to last six months or longer. In 2010, 7.5% (5.5%, 9.5%) of Simcoe Muskoka residents (12+) reported having asthma. This was not significantly different than the provincial self-reported asthma prevalence rate of 8% (7.7%, 8.9%). 

 

The trend in self-reported asthma prevalence in Simcoe Muskoka between 2003 and 2010 was relatively stable, remaining between eight and 10%. The trend in self-reported asthma prevalence for Ontario as a whole also remained stable, coming in at eight per cent for each of the survey years (see figure one). 

 

Figure One  

 

 

 

 

In 2011, the Institute for Clinical Evaluative Sciences (ICES), an independent Ontario research organization, published estimates of active asthma prevalence at both the provincial and public health unit level on their inTool website. Active asthma was defined as having one or more asthma-specific outpatient or inpatient claim within a given fiscal year. Estimates were produced for the 1996/97 through to the 2006/07 fiscal years.  

 

In the 2006/07 fiscal year, the age-standardized prevalence rate of active asthma in Simcoe Muskoka for all ages and both sexes was 31.6 (31.1, 32.1) per 1,000 persons. This was significantly lower than the Ontario active asthma rate of 34.2 (34.1, 34.3) per 1,000 persons. In 2006/07 the active asthma prevalence rates in Simcoe Muskoka were highest among children less than ten years old (see figure two).

 

Figure Two  

 

 

 

The trend in active asthma prevalence in Simcoe Muskoka was relatively flat between the 1996/97 and 2001/02 fiscal years; however, the rate declined significantly between the 2002/03 and 2006/07 fiscal years with an annual percentage decrease of 2.6 (1.5, 5.2) per cent (or a total percentage change of 14 per cent for the five-year period). The trend in the Ontario active asthma rates followed a similar pattern to what was observed in Simcoe Muskoka over the same time period (see figure three).

 

Figure Three  

 

 

  

Incidence

 

The rate of new asthma cases (also called the incidence rate) provides a measure of the risk of developing asthma over a given period of time. This is different from the asthma prevalence rates presented above, which provide a measure of how wide spread asthma is over a given period of time.

 

In 2011, ICES also published asthma incidence rates at both the provincial and public health unit level on their inTool website. A new (or incident) case of asthma was defined as having one or more asthma-specific outpatient or inpatient claim within a given fiscal year and no other claim for asthma in the previous five years.

 

In the 2006/07 fiscal year, the age-standardized incidence rate of asthma in Simcoe Muskoka for all ages and both sexes was 5.6 (5.4, 5.9) per 1,000 persons. This was significantly lower than the Ontario asthma incidence rate of 6.96 (6.91, 7.01) per 1,000 persons. In 2006/07, the asthma incidence rates in Simcoe Muskoka were highest among children less than four years age (see figure four).

 

Figure Four 

 

 

 

The asthma incidence rates in Simcoe Muskoka declined significantly between the 1996/97 and 2006/07 fiscal years, with an annual percentage decrease of 4.7 (4.2, 5.2) per cent (or a total percentage decrease of 39 per cent for the eleven-year period). The trend in Ontario‚Äôs asthma incidence rates followed a similar pattern to what was observed in Simcoe Muskoka over the same time period (see figure five). 

 

Figure Five